Chronic oxidative stress — the imbalance between reactive oxygen species (ROS) production and antioxidant defense capacity — underlies aging, cardiovascular disease, neurodegeneration, and metabolic dysfunction. Peptides offer targeted antioxidant support that addresses the mitochondrial source of ROS rather than just scavenging downstream reactive molecules.
1. SS-31 (Elamipretide) — Mitochondrial ROS Source Suppression
SS-31 is the most targeted mitochondrial antioxidant peptide studied. It concentrates at the inner mitochondrial membrane, protects cardiolipin from oxidative damage, and reduces electron leak from the respiratory chain — directly suppressing ROS at its primary source rather than scavenging downstream. SS-31 has demonstrated efficacy in cardiac, renal, and neurological oxidative stress models.
Dosing Protocol: 1–5 mg SubQ daily. Clinical doses 0.05–0.25 mg/kg IV. SubQ protocols emerging for chronic oxidative conditions. Cycle: 4–8 weeks.
2. Epithalon — Antioxidant Enzyme Activation / Telomere Protection
Epithalon activates antioxidant enzymes including superoxide dismutase (SOD) and catalase, reduces lipid peroxidation, and protects telomeres from oxidative shortening. It provides upstream antioxidant protection by upregulating the body’s own defense systems rather than providing exogenous antioxidants.
Dosing Protocol: 5–10 mg SubQ daily for 10-day courses. Repeat 2–4x per year.
3. GHK-Cu — Antioxidant Gene Activation
GHK-Cu activates over 30 antioxidant-related genes including SOD, catalase, and glutathione peroxidase — substantially increasing endogenous antioxidant capacity. It also chelates pro-oxidant free copper ions, preventing Fenton reaction-driven hydroxyl radical generation. This combination makes GHK-Cu a comprehensive antioxidant system activator.
Dosing Protocol: 1–2 mg SubQ daily for systemic antioxidant effects. Topical for skin oxidative stress. Long-term continuous use well-supported by safety data.
4. MOTS-C — Mitochondrial Antioxidant Metabolism
MOTS-C activates AMPK and Nrf2 — the master transcription factor for antioxidant gene expression. Nrf2 activation upregulates hundreds of cytoprotective genes including those encoding glutathione synthesis enzymes, thioredoxin reductase, and heme oxygenase-1. MOTS-C connects mitochondrial health to the systemic antioxidant response.
Dosing Protocol: 5–10 mg SubQ 3–5x per week. Cycle: 4–8 weeks.
SS-31 addresses ROS at the mitochondrial source — the most impactful point of intervention. Epithalon and GHK-Cu activate the body’s own antioxidant enzyme systems for endogenous defense capacity. MOTS-C connects mitochondrial metabolism to Nrf2-driven antioxidant gene expression — ensuring the cellular machinery for oxidative defense is fully engaged.
- Szeto HH et al. (2014). SS-31 mitochondrial antioxidant. J Mol Cell Cardiol.
- Khavinson VKh et al. (2003). Epithalon and antioxidant enzymes. Neuroendocrinology Letters.
- Pickart L et al. (2018). GHK-Cu antioxidant gene activation. Int J Mol Sci.
- Lee C et al. (2023). MOTS-C and Nrf2 antioxidant pathway. Nature Medicine.
Research Use Only. All information on this page is for educational purposes only and is not medical advice. PepSherpa does not sell peptides. Consult a licensed healthcare provider before making any health decisions. Many of the studies cited are preclinical (animal/in-vitro).